@MeasurementBlues: ...do you like the idea of using for fingers to zoom in on a signal?

Well duh! LOL The iPad interface is now so intuitive to me that I find myself trying to use my fingers to zoom in/out on every screen I come across -- it always comes as an unpleasent surprise when I realize I'm not using a touch screen.

With regular displays you have to use your mouse (or control keys) to pan and zoom in/out ... it's so much easier to use your fingers (so long as you aren;t currently playing a guitar).